PLATE XCII. 
b. Dental sockets. d’. Umbonal cavity. 
e. Crura. j. Cardinal process. 
EoorTHIS REMNICHA SULCATA (Walcott) (p. 787). 
Figures 1 and lb. Natural cast of dorsal valves from Locality 97a, Upper Cambrian sandstone near Winfield, Jefferson 
County, Wisconsin. U.S. Nat. Mus. Cat. Nos. 52365a and 52365b, respectively. 
ja and 1c. Natural casts of dorsal valves from Locality 80a, Middle Cambrian sandstone 4 miles (6.4 km.) 
north of Reedsburg, Sauk County, Wisconsin. U.S. Nat. Mus. Cat. Nos. 52366a and 52366b, respec- 
tively. Figure la represents the type specimen. : 
Eoorruis REMNICHA (N. H. Winchell) (p. 786). 
[Text fig. 7, p. 299, and PI. XCTI, figs. 1, la-s.] 
Ficure 2. Exterior of dorsal valve from Locality 302b, Middle Cambrian limestones near Crowfoot Ridge, Yellowstone 
National Park, Wyoming. U.S. Nat. Mus. Cat. No. 35215a. Specimen figured by Walcott [1899, 
Pl. LXII, fig. 1]. 
2a. Interior of ventral valve from Locality 302n, Upper Cambrian limestone on south side of Gallatin Valley, 
Gallatin County, Montana. U.S. Nat. Mus. Cat. No. 52354a. Specimen figured by Walcott [1899, 
Pl. LXI, fig. 3a]. 
2b. Interior of dorsal valve associated with the specimen represented by figure 2a. U.S. Nat. Mus. Cat. 
No. 52354b. Specimen figured by Walcott [1899, Pl. LXI, fig. 3]. ‘ 
2c. Enlargement of exterior of a ventral valve associated with the specimen represented by figure 2, showing 
fine radiating strie. U.S. Nat. Mus. Cat. No. 35215b. Specimen figured by Walcott [1899, Pl. 
LXII, fig. 1d]. 
2d. Ventral and dorsal valves associated with the specimen represented by figure 2a, showing fine radiating 
strie. U.S. Nat. Mus. Cat. No. 52354c. Specimen figured by Walcott [1899, Pl. LXTI, fig. 1c]. 
3; 3a, 3a’, 3a’; and 3c. Three ventral valves illustrating variation in formand costz. The fine radiating striz 
so characteristic of the specimens represented by figures 2c and 2d are largely exfoliated with the 
matrix. A fewtraces of the strie are shown by figure 3a. Locality 12k, Upper Cambrian limestone 
of the Reagan sandstone, sec. 35, T. 1 S., R. 1 E., Ardmore quadrangle, Carter County, Oklahoma. 
U.S. Nat. Mus. Cat. Nos. 52355a, 52355b, and 52355c, respectively. 
3b. Ventral valve from Locality 12n, Upper Cambrian limestone of the Reagan sandstone, sec. 1, T. 2 S., 
R. 1 E., Ardmore quadrangle, Carter County, Oklahoma. U.S. Nat. Mus. Cat. No. 52356b. 
3d. Broad form of dorsal valve associated with the specimen represented by figure 3b. U.S. Nat. Mus. Cat. 
No. 52356c. 
3e. Elongate form of dorsal valve associated with the specimen represented by figure 3. U.S. Nat. Mus. 
Cat. No. 52355d. 
EoorTHIS REMNICHA TEXANA (Walcott) (p. 787). 
Ficures 4, 4’; 4a; and 4b. Three ventral valves, varying in form and surface characters, from Locality 71, Upper 
Cambrian limestone in Cold Creek Canyon, Burnet County, Texas. U.S. Nat. Mus. Cat. Nos. 52369a, 
52369b, and 52369c, respectively. Figure 4 represents the type specimen. 
4”, Back view ofa large ventral valve associated with the specimen represented by figure 4c. The specimen 
can not be located. U.S. Nat. Mus. Cat. No. 52370b. 
4c. Dorsal valve from Locality 12m, Upper Cambrian Arbuckle limestone, sec. 2, T. 28., R. 1 E., Ardmore 
quadrangle, Carter County, Oklahoma. U.S. Nat. Mus. Cat. No. 52370a. 
4d, 4e, 4f, and 4g. Dorsal valves, varying in form and surface characters, associated with the specimens 
represented by figures 4, 4a-b. U.S. Nat. Mus. Cat. Nos. 52369d-g, respectively. 
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